Mobtimee



L `NITED i STATESv PATENT OFFICE.

MORTIMER C. vOGDEN, on BROOKLYN, NEW YORK, AssiGNoR To THEEACLE i LOCK COMPANY, oi TnRnYviLLn CONNECTICUT.

ADJ UST-ABLE BOOK-LOCK.

To all whom it may Concern.-

Be it known that I, MORTIMERO. VOGDEN, of Brooklyn, Kings county, New York,.have

invented a new and Improved `Adjustable Book-Lock, of which the following is a full, clear, and exact description.

|This invention relates to that class of locks adapted to be fastened to the free edges of the vIO . adjustablybetween two longitudinally-slotted covers of books for the purpose of holding the books closed, to relieve the back from strain and keep the contents ofthe book from publie perusal when desired.`

The object of my invention is to provide `a new and improved book-lock whichcan be ad- I 5 justed according to the thickness of the book.V

' The invention consists in a lock-casing held angle-pieces pivoted to a plate adapted to be book-covers.

` Fig. 3 is a sectional plan of the same on the line a: w, Fig. 2. i

The lock is held on the book by two plates, A B, secured on the outer surface of the covers insome suitable manner, which plates can be made more or less ornamental, and lboth plates "project slightly over the edges of the The plate B, secured to thebottom cover, is provided at the ends of the outer edge with upwardly-proj Aecting j aws a, to which angle-pieces Q or fiat strips are pivoted, anglepieces being preferred. Those parts of the angle-pieces parallel with the edges of the covers are each'provided with a longitudinal slot, D, through each of Vwhich slots a screw, E,

back of a lock-casing, F, held between those passes into the lower part of the inner side or septemberI 4,1883. y

parts of the` angle-pieces@ at right angles to` theedges of the boolncovers. The plate A is provided with one or more catches or hooks on the under side of its projecting edge, `which,

catches*4 are adapted to pass into slots or openings in the top of the lock-casing. The anglepieces C, holding the lock-casing, can be `swung down from the edge of the book when the book is opened. Y The lock-casing F can easily be adjusted higher or lower, so thatits upper edge will always be flush with the upper edge of the upper cover, and the catches on the plate A can easily be passed into the openings in the top edge of the casing without bending the cover.

lIhe mechanism of the look can be of any desired kind, as the same can be provided witha barrel, spindle, `or flat key, or with a i spring catch or` bolt.

The edges of the slots D are preferably beveled, so that the screw-heads will becountersunk and Cannot be turned or loosened from the side edges of the lock, and cannot be reached when the bc OI is closed and locked.

Having thus described my invention,I claim as new and desire to secure by Letters Patent '1. An adjustable book-lock, made substantially as herein shown and described, and consisting of a lock-easing held adjustably on angle-pieces or strips on a plate adapted to be fastened on the book-cover, as set forth.

2. In an adjustable book-lock, the combination, with the plates A B, of the longitudinally-slotted angle-pieces C, pivoted to the plate B, and the locking-casing F, held by screws E between'the angle-piecesC, substantially as herein shown and described.

\ MORTIMER C. OGDEN.

Witnesses:

R. J. PLOMB,

, W. G. PLUMB. 

